If only tough men could survive the west, only the toughest women could survive those men. That describes Kate Becker. Abandoned to prostitution at a young age, Kate was that rare girl able to save enough money to become a madam herself once she was past her prime - right about when she earned the nickname "Big Rump". Knowing how lonely prospectors can get, she set up shop in a mining town called Cariboo. She considers her recent purchase of Chinese girls a wise investment - but makes the mistake of hiring Captain Billy Fender and Big Ears Bywater to assure their delivery.